Toán Lớp 11: Tìm tập xác định $\frac{1}{sinx}$ + $\frac{1}{cosx}$
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Toán Lớp 11: Tìm tập xác định $\frac{1}{sinx}$ + $\frac{1}{cosx}$
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\left\{ \begin{array}{l}
\sin x \ne 0\\
\cos x \ne 0
\end{array} \right. \Rightarrow \sin 2x \ne 0 \Leftrightarrow 2x \ne k\pi \\
\Leftrightarrow x \ne \dfrac{{k\pi }}{2}\\
\Rightarrow D = \mathbb R\backslash \left\{ {\dfrac{{k\pi }}{2},k \in \mathbb Z} \right\}
\end{array}$